1 . She is a quiet girl at school，but sometimes she _____ be very naughty.

A．should

B．would

C．can

D．will

2 . The weather in the south is generally warm, but it________ be very cold sometimes.

A．may

B．shall

C．will

D．can

3 . We hope that as many people as possible        join us for the picnic tomorrow.

A．need

B．can

C．must

D．should

4 . It be difficult to get a train ticket during traditional Chinese Spring Festival this year because there are many ticket windows.

A．mustn't

B．ought to

C．needn't

D．can't

5 . —Is Pro. Smith giving the speech today?
—It __________ be him. He is abroad right now.

A．can’t

B．needn’t

C．won’t

D．mustn’t

6 . —I heard they went skiing in the mountains last winter.
—It ______ true because there was little snow there.

A．may not be

B．won’t be

C．couldn’t be

D．will be

7 . The little boy_____be very naughty, but he is very lovely.

A．must

B．should

C．can

D．shall

8 . Mary _____ be in London because I saw her in town just now.

A．mustn’t

B．isn’t able to

C．needn’t

D．can’t

9 . She ________the film, for she knows nothing about it.

A．can’t see

B．can’t have seen

C．must see

D．mustn’t have seen

10 . You ______ be hungry already — you had lunch only two hours ago!

A．wouldn’t

B．can’t

C．mustn’t

D．needn’t